From ESGREEN

Raw (uncooked) Pu-erh green leaves stuffed into a whole Xin Hui Tangerine Peel! The leaves are packed into the fruit wet, and then dried under the sunlight.After that, the packed tangerine teas are then stored in a cool dry location, allowing the tea to ferment and dry within the tangerine peel. While drying the pu-erh tea absorb the flavor of tangerine.

One of the things you’ll notice about this tea when you brew it is the absence of the heavy musty flavor characteristic of traditional pu-erh. Certainly this character is still there but it is layered beneath sweet notes of tangerine, the result of being packed in the tangerine peel before fermentation. As the tea ages it absorbs the flavor of the peel.
The scent and taste of tangerine is very present in this mellow, smooth, fermented in tangerine pu-erh tea. The peel can be broken up and brewed along with the leaves for a stronger tangerine flavor.